Comment #3 on issue 3073 by matt...@gmail.com: Ordering args in Adds when
printing to move negative signs
http://code.google.com/p/sympy/issues/detail?id=3073
Yes:
pprint(-x + y, order="lex")
-x + y
pprint(-x + y, order="rev-lex")
y - x
but that's just simple symmetry.
Anyway, it may not be possible to fix this on ordering level, because the
case outlined in this issue may work only for certain expressions like 1 -
x or y - x, but what about -x**2 + x - 1 or -x**2 + x + 1? (it wouldn't be
appealing to print x - x**2 - 1 in the former case)
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